Air-feeding grate for furnaces.



No. 886,546. i PATENTED'MAY 5, 1908.

- J. o. SCHMIDT,

AIR FEBDING GEATE FOR FURNAOES. APPLICATION FILED 13.29.22,'1905.-

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JOHANNES OSKAR SHMIDT, OF MNCHSMALDE, NEAR 'BAUTZEN, GERMANY.

AIR-FEEDING GRATE FOR FURNACES.

To all .whom it may concern:

Be it known that 1, JOHANNES OsKAR SCHMIDT, a subject of the King ofSaxony,

residing at Mnchsrnalde, near Bautzen, Saxony, Germany, have inventedcertain new and useful Improvements in Air-Feeding Grates for Furnaces,of which the iolloW- ingis a specification` t This invention relates tothat class of gratos for furnaces known as air-ieeding grates and theobject of the invention is to -p1;ovide,lan improved grate of this classwherein sim iicity of construction is attalned and t orough. andcomplete combustion is 'effected with economical consumption of fuel.

With this object in view the invention consists in the im rovedconstruction arrangement and com ination oi parts hereinafter fullydescribed and afterwards specifically claimed. I

I have illustrated the invention in the accompanying drawing in which IFigure 1 is a sectional view on avertical plane passing longitudinallythrough oneof the grate bars of a furnace equipped With my invention,parts being broken away. Fig. 2 is a plan view of my improved grate, thechannels through the grate-barsbeing shown in dotted lines. Fig. 3 is aplan view, on. an enlarged scale cfa single grate bar. Fig. 4

" is a vertical sectional view on the line 4 4 of Fig. 3. Figs. a and d"are, respectively,

transverse vertical'sectional views. on ther lines la-4a and ehe-450iFig. a. Fig. 5 is a front elevation of part of the perforated A late atthe front end oi the @rate bars.

ig. 6 is a vertical, longitudinal, sectional View of a modiied forni ofmy improved grate bar, and Figs. 6a and 6b are, respectively, transversevertical sectional views on the lines -l, and b-b of Fig.

Referrin specifically to the drawing. 10

` indicates t e tire box or combustion chamber of a furnace which for'the pur oses oi my invention hasa door of any suita le con struction asat 11, the height of the fire-box being reduced by depressing its coveras at' 12. There is also a transverse fire bridge 13, near the rear end,beyond and to the rear of which, and between it and a second and higherfire bridge 14 is formed a secondary combustion chamber 15 from whichleads a suitable exit.

,My improved grate bars, indicated at 16,'

Specification of Letters Patent. Application filed December 22, 19115.Serial No. 293,044.

Patented May 5, 190s.' i

are supported upon any suitable transverse support at front or rear.These`grate-bars are provided with longitudinal passages as at 17 whichat their forward ends terminatev in a transverse chamber 18communicating, through openings 19 in the'top ofthe 'gratebars,=".viththe iirelbox, and through. openings 20 in the bottoms of the grate-bars,near their rear ends, the channels 117. communicate With the ash it 21.

The bottom of t etransverse' chamber 18 is automatically closed by meansof a Wei'ght- 'l ed valve 22, which may be opened, by any suitablemeans, for cleaning the chamber, or for permitting of the passage of airdirectly through the chamber into the Alire-box at the front of thegrate.

The openings 2O are provided with a transverse valve 23 connected by alink 24, with an operating bar 25 Wheref by vthere may be admitted tothe passages 17. any suitable quantity of air required for pro ercombustion.

T e chamber 18 in the construction shown in Figs. 1 toll is providedWith a separate i'rontwall plate 26 and a rear Wall plate 27 suitablysecured in position, the latter hav- 4ing openings 28, Fig. 5,registering with the iront ends of the passages 17, but in theconstruction oi Fig. 6, this front wall indicated -at 29, is part of thegrate bar itself and the rear Wall 27 is omitted. y

1n o eration, air, artly warmed in its pas,- sage t rough the as -pit21,asses through openings 20 into and throng the passages 17 of the gratebars, and out ofsaid channels through the chamber 18and openings 19 intothe fire box, through which it passes, over the live coals, beingconfined in its passage closely to said coals b the depressed cover ofthe tire-box. Att e rear oi the fire box, mixed tion of the fuel andgases with an obvious` economy of fuel. 'The grate bars are separatedfrom each other, as is usual, thus adico 4verse chamber at the .front ofthe grate, air- .ash-pit and near their front ends into the chamber atthe front end of the'grate, air-- 'ai'lording communication between thetranseeding grate bars having longitudinal passages opening near theirrear ends into the transverse chamber which also communicates with theash-pit, each Agrate-bar also having a vertical opening near its frontend ai'lording communication between the transverse chamber and thelire-box, substantially as described.. Y

`2. In a furnace comprising an ash-pit aire-box, an interposed grate, atransverse feeding grate bars having' longitudinal passages opening neartheir rear ends into the ash-pit, and near their front ends into thetransverse chamber` which also communicates vwith the ash-pit, eachgrate bar also. having avertical opening near its front end versechamber and the rire-box, in 'combinan tion with a single valve forclosing all of' the rear openings, and an automatically.closing esserevalve for closing the bottom of the transverse chamber, substantially asdeserlbed.

.0. En a furnace grate, grate bars each oi" which comprises a rearportion of full width l whereby when they are placed side by side in thegrate there is no space between these portions, a middle portionextending from the rear portion nearly to the front of thebai-,

such middle portion being of reduced width so that the usual spaces areleft between'thfv bars, and a forward portion of full width but of lessdepththan the rear or middle portion thus forming a transverse chamberbelow them and in iront of the middle portions, themiddle portionshaving longitudinal passages through them communicating at the rear withthe ashlpit and at the front with the chamber below the front portions,and said Jfront portions having vertical openings communicating between.said chamber and the {ire-box, the chamber being suitably inclosed andprovided with a valved. bottom opening, substantially. as described.

In testimony whereof l 4have hereunto set rny hand in presence of twosubscribing witnesses.

p "JOHANES OSKAR l.SCHAHD'I j rlitnesses; i

PAUL E. SoniLLIne, Offro, TG.

